Grinding and polishing table



Dec, 7 1926.

w A B A/W 0 O 1 T 6, 11 1.3! V m dlmzwfw I lllllirlllll. l In Filed Oct. 5, 1923 F E TROUTMAN ET AL GRINDING AND POLISHING TABLE IIIIIrll-lllallll Patented DeC. 192 6 i l i RA n. rnonrivian aivn cr'matns n.

crisis-ring or; BUTLER, rnnusYLvANIA.

" V j "eninnmahn'n roller-truer TABLE. I

.a pli cation filed October 3,";19233' rii1at. 688,347: f

.- Our invention relates to tables for use in grinding and polishing similar purposes.

The object of our inventionis-to provide a, grinding or polishing table composed 0f wheeled sections adaptedto run upon tracks and provided with means for insuring that the upper surfaces of the several sections shall be at precisely'the same level when they are 'broughtto the grinding or polishing'position.

Plate glass has heretofore been: ground .upon large rotary tables which arercostly" and expensive in operation and which requiremuch labor for the purposeoflii-ting theglass upon the table and removing the glass therefrom. It. has been proposed-Ito substitute for these rotary tableslreetangular table's mounted upon wheels so asto runvin series upon tra'cks for the 'purp'osej ofrea' dering the manufacture ofplate glass more nearly a continuous operation; Such. sectional grinding tables have the" disadvam tage thatno matter how carefullythe tables and track'sgare constructed, -the joints between-the tables are more or :lessJ-uneven the-rear edge of oneztable being slightly above or below the-;fr.ont' edge of the next a table; Such differences in the height of the tables interfere with-the grinding and polishing operations because the platesor sheets of glass willnot be engaged properly by the grinding implements.

According to our-inventionzwe insure that all the tables of a series ofgrinding-or polishing tables shall be at -a-constant height and without uneven jointsfwhen the tables are brought to a grindingor polishingposh tion. In one embodiment ofjour invention we accomplish this result by causing zone end of each tableto support: the adjacent,

end o'f the following table the trucks which carry the tables being "so arranged thatat the grinding position the wheels .atthe sup:

ported end of each table are above 'theauX- iliary-tracks. The rear edges of the tablesmay' be provided with'recessesor ledges for receiving the front edges 'ofthe following tablesin such away thatithe upper surfaces of the tables are in :exact' line vwith each.

other when the-tables support one Q another in the overlapping'manner just described;

or the tables may be arranged to connect with oneanother by means "of dowel pins orthe like.

a V e m Theitrucks of the table sections are'prezplate glass land for erably providedwitlitwo sets ol 'wheelathe hottornslevel-ofone Set- 10f wheels. being slightly. h gher'thanthe bottom level of the other set. One set of wheels. which we term 1 the service wheels are. intended to run'upo'n v ordinaryv tracks; and are used in shifting; the

tahles and in bringing'the tablesto the grlndln'g or polishingpositions; The other set ofwhe'els ma be called the auxiliary wheels, and are adaptedto runupon aux-' v ,iliary tracks which'leadpast thegrinding or pollshing 'positions; 'VVhen the front of :e ach/t-ableris to be supported on the rearledge of the preceding tablethejfro'nt aux} illarywheels should be somewhat smaller or mounted at aslightly higher elevation than therear auxillary wheels, so that when the overlapping edges" of the tables: are brought together the front auxiliarywheels are In a similar' way the rear-end of e f smaller diameter The accompanying drawingshows the arrangement in which the front-end'lof each table is supported on the rear of the next run off. from the service track and the front end of the table is therebyw causedto: descend into 7 a seat" formd in the rear end: oiflthe precedingi-able'. ,Each table follov' in'g the preceding table Asfleachl'table arrives the auxiliary track its frontfservice wheels 1 ,first isthus supportethwhile at the grinding i 'position'upon itsrear wheels and "upon the rear. endfof the next ';-preced1ng ;table.

Therefore the upper surfaces-of thetabl'es grinding position u'po'nfboth the frontvand rear auxiliary wheels andtheifront of the Twill beflatithe same levelpieven though the r tracks may be somewhat irregular. v first table 'ofthe serie'sis supported at the first table is therefore 'v'eryaslightlyfbelow its rear end. This-trifling inclination thus given to the'first table'is so small as to be negligible. 'If it is desired to" avoid even this slight inclinationfof the first table, an

auxiliary table or car'inay befprovided to*- precede the'firsttab'le and-support its front endyin which-case onl-ythe rear sets of auX- -1l1ary 'wheels need be provided on the tables In the accompanying drawing Fig; 1 is a s de elevational v ew of a series of grinding orpolishing tables constructed and 'a1'- ranged according to our invention; Fig. 2 is a similar view showing the tables advanced somewhat farther to the left; Fig.

Bis a plan View of a portion of the construction shown in Figs. 1 and 2; Fig. 4 is a rear elevational View of one of the table sections; Fig. 5 is an enlarged fragmentary the tracks 5 is a pair. ofauxiliary tracks"?- which are preferably ata somewhat higher "elevationthan service tracks 5 and are of a gauge either narrower or wider thanthe tracks 5. the tables 2 to suitable grinding or polishing mechanism, n'otshown; The shafts 9 'which carry theservice wheels 4 of each ta-' 'ble section also carry pairs of aux1l1ary wheels 10 which are of proper diameter and properly spaced to run upon the auxiliary tracks 7 while the rear wheels. 4 are still resting upon the tracks 5. The treads of the front auxiliary wheels 10 are preferably about one-eighth of an inch higher than the treads of the rear wheels 10, so that when passing to the auxiliary tracks the front end i of the rearcar will tend to descend to a tablesso as to prevent relative lateral movelower level than the rear'end of "the preceding car. g At the rear ed'ge'ofeach of the table sections 2 is a ledge 11 of proper size and shape to receive and support a projection 12 which extends forward from the front edge of the next succeeding table. The vertical height 0f the projection 12 is made exactly the same as the distance between the top of the ledge 11 and the top of its table, so that when the projection 12 rests upon the ledge ll'the upper surface of the two tables 'will be at the same level as shown at the left of Fig. 2. f 1 I For the purpose ofpreventing the tables from relative lateral movement when they are in engagement, each ofthe ledges 111s provided with a V-shaped notch 13 which receives a correspondingly shaped projection 14 formed on the under side of the projection 12 of the following table. If desired,

the projections 12 may be provided with recesses and the ledges 11 with projections,

or other equivalent means may be provided for interlocking the meeting portions of the ment.

The vertical. meeting surfaces of the ta- The auxiliary tracks 7 conduct bles may be provided with strips of rubber or other cushioning material indicated at it;

gage each other.

meeting surfaces as may be desired.

Anotherfeature to which attention is directed resides in the provision of upwardly extending ribs 2 which serve as retaining walls to prevent the plaster and sheets of glass from sliding off the table. Heretofore holes have been drilled adjacent to the'edges of casting tables for the reception of pegs or pins whereby the plates of glass are heldin position upon the table top. These pegs become worn down and have to be replaced, or become broken and tie holes have to be redrilled, and also the plaster with which the tables are usually covered oozes 'overrthe edges of the tables, drops to the floor and causes litter, besides. which the continuit the plaster. surface-on whichthe glass is supported is destroyed, and the glass imperfectly supported at some points. These objectionsare avoided by the use of the ribs as 5 shown. These ribs may be veither formed in tegrally with the table top or consist of strips i secured thereto by screws, bolts or the like.

In the operation ofthe grinding or polishing tables constructed- 'in the manner (l e; scribed above,.the tables are covered with laster in the usual manner to a thickness preferably less than the height of the ribs above the table top, and the sheets or plates ice of glass are laid on the tables, suitably by means of the suctionilifting apparatus de-' V V scribed andhclain ed in thecopending ap- 'plication for Letters Patent of 'Ifroutman and Christie filed January 20, l923,-Ser;ial No. 613,949, now Patent No. 1,535,064 da ted April 1, 1925. l/Vhen the tables are thus prepared, they are pushed along the service tracks 5 with the front edge ofeach table slightly above the level of thefrear ed'geof the preceding'table until the front wheels 3 of thetable run off from the ends 6 of the service tracks 5 whereupon the front end of ;the table descends until its -projection'12 rests upon the ledge 11 of the preceding table. Before the rear wheels4 have reached the ends. 6 of the service tracks 5 the aux iliary wheels 10 have run upon the auxiliary tracks 7 and are ready to support the table i It will he'evident that the principles of our invention may be carried out by revers-v ing the ledgesll and the projections 12 and making the "front end'ofeach table support the rear end of the preceding table, the arrangement in such case'being similar to that,

7 shown in 1 in which it maybe assumed that thecars in'Fig. 1 areadvanced to the right instead of to the left, with the arrangement of the tracks reversed. Various other I changes inthe Construction and arrangement WVe claim as our invention: 7 p v r 1. Apparatus for grinding, and polishing flat'glass comprising two sets of tracks arrangedin alignment with each other and of 'difierent gages and at different heights, and

a plurality of grinding,orlpolishing tables each having front and rear wheels adapted to run upon one of said tracks and having auxiliary wheels adapted to runf'upon the other track, the said table having means for causing the end of each table adjacent to said auxiliary wheels to support' the end of an adjacent table when the said tables restupon said'auxiliary track.

'2. Apparatus for grinding and polishing flat glass comprising two sets of tracks ar- 7 ledge of a similar table, means for prevent ing. relative lateral movement of the assorciated i ledge's and projections, and cushion-, ing means, associated with said ledges and gagement ofthe said tables.

rangedlin alignment with each other and 6f v difl'erent gages 'andof dilferentheights, and. a plurality of grinding or polishing tables having front and rear wheels adapted to run upon one of said-tracks and having auxiliary wheels adaptedto' run'upon theothertrack,i H

each ofthe'said tables having a ledge pro jecting from one end thereof and a projec tion at'the other end adapted'to rest upon the projections, for cushioning the shock of en-v 3. 'Apparatus for grinding or polishing fiat glass comprising a plurality of relatively movable associated tables, a'projectio'n on, I one of ,said tables, and a horizontally disposed engaging surface on an adjacent portion; of'anothertahle, the riding support for said-tables beingarrangedto bring said pro-- JQCtlOIi to rest upon said engaglng surface,

to maintain the surfaces'of said tables in horizontal alignment. q H v 7 1n testimony whereof we, the said'FRANn E." TROUTMAN and CnARLns 'H. CHRISTIE,

have hereunto set our hands. a FRANK E; TROUTMAN.

CHARLESH. CHRISTIE.

DISOLAIM.ER.

1,610,184.-Fmn70 E. Trawtmarn and Oharles H. Christie, Butler, Pa. GRINDING AND POLISHING TABLE. Patent dated December 7 1926. Disclaimer filed May 11, 1928 by the patentees.

Hereby enter this disclaimer to that part of the claim in said specification which is in the following Words, to Wit:

3. Apparatus for grinding or polishing flat glass comprising a plurality of relatively movable associated tables, a projection on one of said tables, and a horizontally disposed engaging surface on an adjacent portion of another table, the riding support for said tables being arranged to bring said projection to'rest upon said engaging surface, to maintain the surfaces of said tables in horizontal alignment.

[Oficial Gazette Mag 29', 19%.] 

